The fourth Batman feature, from 1997, stars George Clooney under the pointy-eared cowl, with Chris O'Donnell returning as Robin the Boy Wonder. This time the dynamic duo battles the nefarious Mr. Freeze (Arnold Schwarzenegger), who is obsessed with turning the world into an iceberg, and the slyly seductive but highly toxic Poison Ivy (Uma Thurman), who wants to eliminate all animal life and turn the Earth into a gigantic greenhouse. Alicia Silverstone lends a hand as Batgirl, and Elle McPherson plays Batman/Bruce Wayne's fiancée.